[rabbitmq-discuss] Sending messages with abstract types as properties

Tim Watson tim at rabbitmq.com
Fri Oct 26 01:59:15 BST 2012


On 26 Oct 2012, at 01:57, Tim Watson wrote:

> Hi
> On 25 Oct 2012, at 22:36, kayslay wrote:
>> I have a message that I'm sending and one of it's properties is an abstract type.  When I send this message I get an exception on the receiver from the json serializer:
>> How am I able to receive a message that has an interface or abstract type property, here MyPayload is an abstract class?
>> Thanks
>> Exception:
>> Newtonsoft.Json.JsonSerializationException: Could not create an instance of type
>> MyNamespace.Payloads.MyPayload. Type
>> is an interface or abstract class and cannot be instantated. Path 'Payload.Id',
>> line 1, position 17.
> This is really a question for however supplies the Newtonsoft.Json package. I know that with some serialisation frameworks this just works transparently, because the framework 'bakes' the concrete classname into the representation at runtime, but gives you back a reference to the type you're expecting. Some frameworks allow you do write serialize/deserialize hooks to do this as well. Generics add a bit more complexity.
> Either way, this hasn't really got anything to do with RabbitMQ so I'd suggest contacting the author on github, assuming it is https://github.com/mikehadlow/EasyNetQ that we're talking about.
> Cheers,
> Tim
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